Electrolytic condenser



April 30, 1940. G. B l-NIEK ELECTROLYTIC CONDENSER Filed Au 15, 1935INVENTOR GEORG BINIEK I BY MW ATTORNEY Patented Apr. 30, 1940 STATES,PATNT ELECTROLYTIC (ZOIJDI'IIIfiER Georg Biniek, Berlin, Germany,assignor to Siemens & Halske, Aktiengeselischaft, Siemens stadt, Berlin,Germany, a corporation of Germany ApplicationAugust 15, 1936, Serial No.96,174 In Germany August 15, 1935 2 filaims.

' packing, owing to the effect of air and light, is

subject to embrittling so that the electrolytic condenser and itsoperation will be impaired.

It has been therefore suggested in the earlier art to cover the valvebody made of rubber by another body which, upon production of aninadmissibly high pressure in the interior of the condenser containerwould be destroyed. In this arrangement, the rubber disks are affordedcomparatively little chance forexpansion.

However, it is often desirable that the valve body should be destroyedonly after an overpressure has been in existence for a relatively longperiod of time, especially where condensers having a casing consistingof cardboard, paper, or the like are concerned, seeing that in theircase a certain escape of gases is permitted to occur across the porouswall of the casing. In other words, premature destruction of the valvebody, as will thus be seen, would make replacement of the condensercompulsory in spite of the fact that a normal condition might have beenrestored as a result of the perviousness of the wall of the cas- By thepresent invention, the drawbacks hereinbefore enumerated are obviatedwithout exception, this being accomplished by the membranous partserving as a valve being covered by a curved cover part preferablyconsisting of a disk of cardboard material. Hence, the said diaphragm ormembrane has a chance to expand first to the extent permitted by thecurvature before actual rupture will happen. Atthe same time, the coverdisk prevents damaging of the diaphragm from the outside.

According to another object of the invention. the diaphragm is placedupon a support, preferably a cardboard disk, and is glued thereon, butonly along the circumferential portions of the cardboard disk in orderto offer a larger effective surface for expansion. At the same time,

the cardboard disk serves for protecting the diaphragm when introducingthe condenser.

The drawing shows an exemplified embodiment of this invention.

Fig. 1 shows the assembly arrangement partly in section;

Fig. 2 is a top view of the curved cover disk;

Fig. 3 is a side elevation of the said curved cover plate; while Fig. 4is a top view of the cardboard disk upon which the diaphragm is fastenedby gluing or cementing,

The condenser body 5 is confined inside casing 2 made preferably ofcardboard, the casing being shut by means of a cardboard disk 3 as 1shown in Fig. 4. The cardboard disk 3 has several holes 8 for theevacuation of gases.

Diaphragm or membrane A consisting, for instance, of cellulose paper isfastened by glue only on the margin or edge 5 on the cardboard disk 3.The curved cardboard disk which has gas vents 'l is pressfitted forinstance, into the tubular cardboard case 2. If, then, over-pressure isset up inside the condenser case, the diaphragm 4,

made of cellulose paper will first have a chance to extend around theperiphery of the curvature in cardboard disk 6. While this happens, thegases have a chance to penetrate through the porous walls of thecardboard casing 2. However, if the rise of pressure becomesunpermissibly high, the diaphragm 4 will be caused to break and thusaffords a path for the gases to escape or be vented through the holes Iin the cambered cardboard disk 6.

' What is claimed is:

1. A valve arrangement for an electrolytic condenser comprising a casingfor said condenser body, a perforated disk-like cover having a pluralityof gas vent holes at one end of said casing, a. second perforated covercurved outwardly from said first mentioned perforated cover, and a thinmembrane which will rupture upon an excessive rise of internal gaspressure interposed between said first and second mentioned perforatedcovers.

2. A valve arrangement for an electrolytic condenser comprising a casingfor said condenser body, a perforated cover at one end of said casing,a. second perforated cover curved outwardly from said first mentionedperforated cover, and a thin membrane which will rupture upon anexcessive rise of internal pressure secured to the peripheral edge ofsaid first mentioned perforated cover.

GEORG BINIEK.

